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OK, thank you very much for your guidance.

Hello, advanced friends
I'm new to OPNsense. Even though I've figured out the basic settings, I can still successfully set up a basic environment through DHCP.
I would like to ask all the experts, if:

There are three devices in the intranet 192.168.1.0/24

A host: 192.168.1.100
B host: 192.168.1.10
C host: 192.168.1.20

Wan
All three hosts can access the Internet

Lan Lan
A host: can SSH to B and C hosts
Host B: Unable to connect to all hosts
Host B: Unable to connect to all hosts

If possible, which function of OPNsense should I use to achieve this plan?
Firewall?

I would also like to ask the experts for their generous guidance, thank you very much.

Because we are using translation software, there may be words that are not clearly expressed, so please don't mind.

各位先進朋友大家好
我初入OPNsense，雖然弄好了基礎設定，也能順利透過DHCP建立起基本的環境
想請問各位高手，假如：

內網192.168.1.0/24 共有三台設備

A主機：192.168.1.100
B主機：192.168.1.10
C主機：192.168.1.20

Wan
三台主機都能訪問Internet

Lan
A主機：可以SSH到B及C主機
B主機：無法連線到所有主機
B主機：無法連線到所有主機

假如可以的話，我應該要透過那OPNsense的那一個功能實現這個規劃？
防火牆嗎？

還請高手不吝指導，感激不盡。